Abstract: A method for separating a workpiece includes providing ultrashort laser pulses using an ultrashort pulse laser, and introducing material modifications into the workpiece along a separation line using the ultrashort laser pulses. The workpiece includes a transparent material. The method further includes separating the material of the workpiece along the separation line. The laser pulses form a laser beam that is incident onto the workpiece at a work angle. An optical aberration of the laser pulses during a transition into the material of the workpiece is reduced by an aberration correction device. The laser beam has a non-radially symmetric transverse intensity distribution, with the transverse intensity distribution appearing elongate in a direction of a first axis in comparison with a second axis perpendicular to the first axis.

Abstract: An apparatus for combining a plurality of coherent laser beams includes at least N?1 phase setting devices configured to set a respective phase (??n) of a respective one of the plurality of coherent laser beams, and a beam combination device configured to combine the plurality of coherent laser beams to form at least one combined laser beam. The beam combination device includes a microlens arrangement having at least two microlens arrays configured to form the at least one combined laser beam.

Abstract: A device for generating a laser line on a work plane includes a first laser light source configured to generate a first raw laser beam, a second laser light source configured to generate a second raw laser beam, and an optical arrangement configured to reshape the first raw laser beam to form a first illumination beam with a first caustic and a first beam profile, and reshape the second raw laser beam to form a second illumination beam with a second caustic and a second beam profile. The first illumination beam and the second illumination beam are directed with overlap on the work plane and define a joint illumination direction. The first beam profile and the second beam profile jointly form the laser line on the work plane. The optical arrangement is configured to position the first caustic and the second caustic offset from one another in the illumination direction.

Abstract: A processing optical unit for workpiece processing includes a polarizer arrangement comprising a birefringent polarizer element for splitting at least one input laser beam into at least two partial beams each partial beam having one of two different polarization states, and a focusing optical unit arranged downstream of the polarizer arrangement in the beam path and configured to focus the partial beams onto at least two focus zones. The polarizer arrangement has a further optical element arranged downstream of the birefringent polarizer element in the beam path and configured to change an angle and/or a distance of at least one of the partial beams relative to an optical axis of the processing optical unit.

Abstract: An optical arrangement converts a laser beam into a line-type beam having a line-type beam cross-section that extends along a line direction with a non-vanishing intensity. The arrangement has: reshaping optics having: an input aperture through which the laser beam is radiated in; and an elongate output aperture, the reshaping optics being configured such that the laser beam radiated in is converted into a beam packet with beam segments that emerge through the output aperture; homogenization optics, which contribute to the conversion of the beam packet into the line-type output beam, and by which different beam segments are mixed and superposed along the line direction; and redirection optics configured to redirect the laser beam such that an incidence position/direction of laser beam on the input aperture is changed in dependence on time.

Abstract: An optical arrangement is provided for converting an input laser beam into a linear output beam propagating along a propagation direction and having in a working plane and a linear beam cross section extending along a line direction and having a non-vanishing intensity. The optical arrangement includes a reshaping optical unit having an input aperture for receiving the input laser beam and an output aperture, and is configured to convert the input laser bean into a beam packet having a multiplicity of beam segments that emerges through the output aperture. In addition, a homogenization optical unit is included having a first lens array and a second lens array arranged downstream of the first lens array in the beam path, the homogenization optical unit configured to mix different beam segments of the beam packet along the line direction.

Abstract: An optical arrangement converts an input laser beam into a line-like output beam, which propagates along a propagation direction and which has, in a working plane, a line-like beam cross section extending along a line direction. The optical system includes: a reshaping optical unit having an input aperture, through which the input laser beam is radiated, and an elongate output aperture, elongatedly extending along an aperture longitudinal direction, the reshaping optical unit converting the input laser beam radiated through the input aperture into a beam packet exiting through the output aperture; and a homogenization optical unit which converts the beam packet into the line-like output beam, different beam segments of the beam packet being intermixed and superimposed along the line direction. The aperture longitudinal direction extends in a manner rotated about the propagation direction by a non-vanishing angle of rotation with respect to the line direction.

Abstract: A device for aligning a processing optical assembly of a laser processing machine includes an entrance region for receiving a processing laser beam, a focus zone forming region for forming a measurement focus zone by the received processing laser beam along a target axis, and an imaging unit having a lens and a detector surface. The lens is configured to image measurement laser radiation that leaves the focus zone forming region after the measurement focus zone has been formed, along an imaging axis predefined by the target axis, onto the detector surface. The processing optical assembly is configured to shape a laser beam in the laser processing machine and to focus it along an incident beam axis so that a processing laser beam forms a preset Bessel beam focus zone in a workpiece to be processed.

Abstract: An optical assembly includes a beam path, passing, in succession, through multiple microlens arrays and a Fourier lens assembly. The microlens arrays have a uniform aperture of their microlenses, and the entirety of the microlens arrays has an effective focal length. The optical assembly further includes an adjustment mechanism, configured to adjust a mutual optical distance of at least some of the microlens arrays in the beam path, thereby setting the effective focal length of the entirety of the microlens arrays. The adjustment mechanism has multiple adjustment positions i=1, . . . , M wherein M is a natural number ?2, i is an adjustment position index, at which the term a 2 ? · f ML , i in each case essentially smoothly results in a natural number Ni. ? is a center wavelength, fML,i is an effective focal length fML of the entirety of the microlens arrays set by the adjustment position i.

Abstract: An optical arrangement converts an input laser beam into a line-like output beam, which propagates along a propagation direction and which has, in a working plane, a line-like beam cross section extending along a line direction. The optical system includes: a reshaping optical unit having an input aperture, through which the input laser beam is radiated, and an elongate output aperture, elongatedly extending along an aperture longitudinal direction, the reshaping optical unit converting the input laser beam radiated through the input aperture into a beam packet exiting through the output aperture; and a homogenization optical unit which converts the beam packet into the line-like output beam, different beam segments of the beam packet being intermixed and superimposed along the line direction. The aperture longitudinal direction extends in a manner rotated about the propagation direction by a non-vanishing angle of rotation with respect to the line direction.

Abstract: An apparatus for combining a plurality of coherent laser beams includes at least N?1 phase setting devices configured to set a respective phase (??n) of a respective one of the plurality of coherent laser beams, and a beam combination device configured to combine the plurality of coherent laser beams to form at least one combined laser beam. The beam combination device includes a microlens arrangement having at least two microlens arrays configured to form the at least one combined laser beam.

Abstract: An optical assembly includes a beam path, passing, in succession, through multiple microlens arrays and a Fourier lens assembly. The microlens arrays have a uniform aperture of their microlenses, and the entirety of the microlens arrays has an effective focal length. The optical assembly further includes an adjustment mechanism, configured to adjust a mutual optical distance of at least some of the microlens arrays in the beam path, thereby setting the effective focal length of the entirety of the microlens arrays. The adjustment mechanism has multiple adjustment positions i=1, . . . , M wherein M is a natural number ?2, i is an adjustment position index, at which the term a 2 ? · f ML , i in each case essentially smoothly results in a natural number Ni. ? is a center wavelength, fML,i is an effective focal length fML of the entirety of the microlens arrays set by the adjustment position i.

Abstract: An optical arrangement converts laser beams from at least two laser light sources into a combination beam, which has a beam waist. The optical arrangement has: an optical beam guidance system having at least two separate optical channels for the laser beams, each of the optical channels having an optical terminator for exiting a respective channel output beam of the relevant one of the optical channels; and a deflecting body, which is associated with only one of the optical channels. The deflecting body is configured such that only the respective channel output beam of the associated one of the optical channels is captured and the captured channel output beam is deflected in a direction of a focus region.

Abstract: An apparatus for coupling out radiation from an optical fiber, includes a housing, and a stop having a stop opening for delimiting an output coupling angle of radiation that is coupled out of an output end of the optical fiber to a maximum output coupling angle with respect to a central axis of the stop opening, wherein the stop is arranged in the housing. The stop has a stop body made from a transparent material, the stop body has a first total internal reflection face for reflecting radiation that is coupled out of the output end of the optical fiber with greater output coupling angles than the maximum output coupling angle, and the stop body has a second total internal reflection face for reflecting radiation that propagates opposite to the radiation coupled out of the output end and is reflected back by a workpiece.

Abstract: An apparatus for coupling out radiation from an optical fiber, includes a housing, and a stop having a stop opening for delimiting an output coupling angle of radiation that is coupled out of an output end of the optical fiber to a maximum output coupling angle with respect to a central axis of the stop opening, wherein the stop is arranged in the housing. The stop has a stop body made from a transparent material, the stop body has a first total internal reflection face for reflecting radiation that is coupled out of the output end of the optical fiber with greater output coupling angles than the maximum output coupling angle, and the stop body has a second total internal reflection face for reflecting radiation that propagates opposite to the radiation coupled out of the output end and is reflected back by a workpiece.